diff --git a/src/upm.i b/src/upm.i
index 00fbad5e..ee88e07e 100644
--- a/src/upm.i
+++ b/src/upm.i
@@ -1,3 +1,4 @@
 %include "std_string.i"
+%include "stdint.i"
 
 %typemap(out) mraa_result_t = int;